Question : Directions: Three of the following four triads are alike in a certain way as they are formed by performing the same mathematical operations among themselves and thus form a group. Which triad does NOT belong to that group?
Option 1: 11 : 21 : 121
Option 2: 7 : 15 : 49
Option 3: 2 : 3 : 4
Option 4: 9 : 17 : 81
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Correct Answer: 7 : 15 : 49
Solution : Let's check each option – First option: 11 : 21 : 121→(11 × 2) – 1 = 22 – 1 = 21; 112 = 121 Second option: 7 : 15 : 49→(7 × 2) – 1 = 14 – 1 = 13 ≠ 15; 72 = 49 Third option: 2 : 3 : 4→(2 × 2) – 1 = 4 – 1 = 3; 22 = 4 Fourth option: 9 : 17 : 81→(9 × 2) – 1 = 18 – 1 = 17; 92 = 81
Hence, the second option is correct.
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Question : Directions: Three of the following four triads are alike in a certain way as they are formed by performing the same mathematical operations among themselves and thus form a group. Which triad does not belong to that group?
Option 2: 2 : 3 : 4
Option 3: 7 : 15 : 49
Option 1: 24 : 25 : 5
Option 2: 35 : 36 : 6
Option 3: 8 : 15 : 3
Option 4: 3 : 10 : 2
Option 1: 12 : 47 : 60
Option 2: 4 : 16 : 20
Option 3: 2 : 7 : 10
Option 4: 5 : 19 : 25
Option 1: 2 : 5 : 8
Option 2: 5 : 10 : 125
Option 3: 12 : 25 : 1728
Option 4: 3 : 7 : 27
Option 1: 36 : 13 : 7
Option 2: 16 : 9 : 5
Option 3: 72 : 16 : 8
Option 4: 1 : 3 : 2
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